测量电压时,对电压表要求是()。
A、与电路串联,内阻大些
B、与电路串联,内阻小些
C、与电路并联,内阻大些
D、与电路并联,内阻小些
参考答案:C
It was the news ____ the movie star would come to our school ____ let us understand the meaning of the word “fanaticism(狂热)”.
A.that; which
B.when; that
C.what; so
D.that; that
气相色谱仪除了载气系统、柱分离系统、进样系统外,其另外一个主要系统是()
A.恒温系统
B.检测系统
C.记录系统
D.样品制备系统