强镇痛药中,“为人工合成的强效镇痛药,作用强度为吗啡的12000倍”为()
A.吗啡
B.罗通定
C.二氢埃托啡
D.延胡索乙素
E.哌替啶(度冷丁)
参考答案:C
His father got him a jib in a bank but soon it became clear ______ he was not fit for that kind of work .
A.that
B.why
C.what
D.whether
互感器一次侧做交流耐压时,二次线圈应采用()措施。
A、接地
B、接壳
C、短路接地
D、短路