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【单选题】
气管切开使用的金属内套管。通常多长时间更换一次A.
1－2小时
B.
2－4小时
C.
4－8小时
D.
8－16小时
E.
24小时
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举一反三
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【单选题】In deciding _____ a course of action，the candidates tried to estimate its likely impact on the voters .
A.
what to pursue
B.
which to pursue
C.
whether to pursue
D.
if to pursue
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【单选题】______ would you solve the problem if this method failed? ( )
A.
What else
B.
How else
C.
How little
D.
How else
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