Is that the reason ______ at the meeting for his carelessness in his work? Actually we think he is a man who

is hard ______ himself especially in work. [ ]

A. that he explained to all; on

B. what he explained all; with

C. why he explained to all; at

D. which he explained to all; to

减少钙离子对非去极化肌松药的作用是()

A．减弱

B．增强

C．无影响

D．不肯定

E．影响的程度与肌松药剂量有关