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【单选题】
直流系统仪表的准确度等级一般不低于1.5级，在缺少1.5级仪表时，可用2.5级仪表加以调整，使其在正常条件下，误差达到( )的标准。A.
0.1级
B.
0.5级
C.
1.5级
D.
2.5级
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反馈参考答案：
举一反三
【单选题】Recently he______ every night until after one o' clock, preparing for the final exam.
A.
shows up
B.
show off
C.
stays in
D.
stays up
【简答题】心肌细胞自动节律性形成的基础是?
【单选题】When he was there, he ________ go to that coffee shop at the corner after work every day.
A.
must
B.
should
C.
would
D.
might
【单选题】Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid _____ pressure.
A.
depending on
B.
in relative to
C.
regardless of
D.
because of
【单选题】The hot oils used for frying ______.
A.
is kept fresh every day
B.
may be used for a week
C.
should be changed every 3 days
D.
is changed from hour to hour
【单选题】心肌细胞自动节律性形成的基础是
A.
4 期自动缓慢去极化
B.
2 期Ca 2+ 内流
C.
4 期存在最大舒张电位
D.
0 期与Na + 内流有关
E.
3 期K + 外流
【单选题】'Life is like walking in the snow', Granny used to say, 'because every step [ ]
A.
has shown
B.
is showing
C.
shows
D.
showed
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