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效力最差的是金霉素 、 土霉素和四环素.用英语怎么说？

效力最差的是金霉素 、 土霉素和四环素.

Least effective were chlortetracycline, oxytetracycline, and tetracycline.

相关词汇
least effective were chlortetracycline and

least

pron. 最小的，最少的，程度最轻的；adv. 最少，最小；

effective

adj. 有效的，起作用的，实际的，实在的，给人深刻印象；n. [军]现役兵额，有生力量，精兵；

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

chlortetracycline

n. 氯四环素；

and

conj. 和，与，而且，于是，然后，因此；
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He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
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Among of them, Phenprobamate and Chlorpropamide are exclusive domestic products.
其中原料药苯丙氨酯和氯磺丙脲为国内独家产品.
Danger! Loose chippings, eg as a warning to motorists.
危险! 小心路面碎石(如用以警告开车的人).
The process of recycle system of chloropropene around the innovation were analysed.
分析了氯丙烯回收系统改造前后的工艺情况.
Chitin and it's derivatives have very important effect on wound healing.
几丁质及其衍生物对创面的愈合有重要作用.
Method and system for removing impurities such as chlorine , chloramines, and ammonia from a hydrogen gas.
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I'm gonna cook me up some chitterlings maw.
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她需要好好度个假来振奋精神.
Bring in our Chippendale chair.
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All wetted rubber parts shall be manufactured from silicone or chloramine resistant EPDM rubber.
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a chink in the curtains
窗帘上的缝隙
The p - chlorophenyl isocyanate is synthesised by carbonyl chloride and p - chloroaniline . The yield is 90 %.
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Furniture covered in this period are Queen Anne ( 1700 - 1720 ), Georgian ( 1720 - 1745 ) and Chippendale ( 1745 - 1770 ).
它包括安妮女王式 ( 1700-1720 ) 、 乔治式 ( 1720- 1745 ) 和齐宾泰尔式 ( 1745-1770 ).
Methods: The synthesis uses urea as material process includes condensation, opening loop, chloridization and nitrosation reaction.
方法以尿素为原料,经缩合, 开环, 氯化,亚硝化而得.
Taking p chlorotoluene as raw material , 2,4 Dichlorotoluene was synthesized via catalytic chlorination process.
以对氯甲苯为原料, 经催化氯化制取2,4二氯甲苯.