简述造成钻出的孔径大于或小于规定尺寸的原因及如何防止？

           team wins on Saturday will go through to the national championships. [ ]

A.No matter what

B.No matter which

C.Whatever

D.Whichever

______与______的比率叫做税率．

句型转换。

根据要求改写句子，每空一词，含缩略形式。

1. My favorite player is Liu Xiang. (对划线部分提问) 

________ ________ your favorite player?

2. I have a toothache.(对划线部分提问)

________ ________ with you?

3. They will leave for Beijing tomorrow.(改为一般疑问句)

_________ _________ leave for Beijing tomorrow?

4. Lucy is going to be a dancer. ( 改为否定句)) .

_________________________________________________

5. You'd better go to see your friend now.(改为否定句)

You ______ ________ ________ go to see your friend now.

下列药物中毒时禁忌洗胃的是()

A．氰化物

B．异烟肼

C．美曲膦酯(敌百虫)

D．硫酸

E．苯巴比妥

巯基乙醇是强还原剂，可将带有二巯键的IgM由19S降到7S的IgM，因而会减少（）。

A.与Fc受体结合的能力

B.结合补体的能力

C.通过胎盘的能力

D.凝集红细胞的能力

E.结合抗原的能力