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【单选题】
心动期中,从动脉瓣关闭到下一次动脉瓣开放的时间A.
心室舒张期
B.
心室舒张期+等容收缩期
C.
等容收缩期
D.
心室射血期
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皮皮学刷刷变学霸
举一反三
【单选题】测量一约为1.5伏特的电压时要求其结果的相对误差小于1.5％，则应选用下列哪一种规格的伏特表（ ）
A.
0.5 级，量程为 5伏
B.
1.0级，量程为 2伏
C.
2.5级，量程为1.5伏
D.
1.0级，量程为3伏
【单选题】Tim is limited .He ’ d better take a taxi to go to work,_______ he?
A.
wouldn ’ t
B.
hadn ’ t
C.
doesn ’ t
D.
didn ’ t
【单选题】He’d better go at once, ______?
A.
wouldn’t he
B.
shouldn’t he
C.
didn’t he
D.
hadn’t he
【单选题】He ’ s got a bad toothache.He ’ d better go to _____.
A.
dentist
B.
the dentist
C.
the dentist ’ s
D.
see the dentists
【单选题】----I _____this morning, but he could not come. ----Well, we’d better go and _____at his office.
A.
called him; call on him
B.
called on him; call him
C.
called at him; call
D.
called him; call at him
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