在测量绝缘前后,应将被测设备()。
A.短接;
B.对地放电;
C.放电;
D.接地
参考答案:B
胃溃疡致瘢痕性幽门梗阻最典型的临床表现是()
A.腹痛
B.腹胀
C.贫血
D.恶病质
E.呕吐
— How can I prepare for class, Mr. Johnson?
— __you ____ my web page? You can download the notes and read them ahead of time.
A.Did; check out
B.Have; checked out
C.Are; checking out
D.Will; check out