机组变压运行，在负荷变动时，要（）高温部件温度的变化。
A.减少；
B.增加；
C.不会变化；
D.剧烈变化。
参考答案：A
关于各类避孕药的主要作用机制，下列说法错误的是（）
A.短效口服避孕药--抑制排卵
B.长效避孕针--改变宫腔环境，不利精子上游
C.避孕药膏--杀精子或使其失去活动力
D.探亲避孕药--抗着床
E.男用口服棉酚--阻止精子生成
---- Do you know _______ they got to know each other?
---- It was last year_______ they both taught Chinese in Scotland.
A．When it was that, when
B．when it was that, while
C．When it was that, that
D．When it was that, as
