用万用表电流档测量被测电路的电流时,万用表应与被测电路()。
A、串联
B、并联
C、短路
D、断开
参考答案:A
小题1:The name of the website is ________.
A.Home
B.Learning English
C.Listening
D.Englishclub.com小题2:The website is useful not only in learning English but also in ________.
A.teaching English
B.finding work
C.travel guiding
D.home setting小题3:The webpage does NOT provide ________.
A.free lessons
B.an advertisement
C.a chat room
D.a questionnaire
如图所示,起重机将重为G的重物匀速吊起,此时四条钢索与竖直方向的夹角均为600,则每根钢索中的弹力大小为 ( )
A.
B.
C.
D.