锅炉汽包蒸发量增加，汽包水位会立即下降。

何谓细菌的耐药性?

选择中间继电器主要考虑的是线圈吸合电压和负载电流。

—John, what was your sister doing while you _____ the piano?

—Oh, she _____ with toys.[ ]

A. played; played

B. played; was playing

C. were playing; played

D. were playing; was playing

脂肪酸进行β-氧化不生成（）

A、H2O

B、乙酰CoA

C、脂酰CoA

D、FADH2

教师资格证的申请时间大约为每年的（）月，并只受理（）的申请。

A.3、4；应届毕业生

B.9、10；在校学生

C.3、4；在校学生

D.4、5；应届毕业生