He went to school without _____ his school bag. [ ]
A. take
B. takes
C. taking
答案:C
如图所示,是一连入电路的电流表的示意图,指针所指的示数为 _________ A.
能引起体位性低血压的药物是:
A.Hydrochlorothiazide
B.Prazosin
C.Guanethidine
D.Methyldopa
E.Nifedipine