一台直流电动机起动时,励磁回路应该()
A.与电枢回路同时接入;
B.比电枢回路后接入;
C.比电枢回路先接入;
D.无先后次序。
参考答案:C
Don’t expect to make much profit ________ the first couple of months after setting up a company.[ ]
A.about
B.on
C. within
D.to
姓氏“毓”的读音是“()”。