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【单选题】
气胸患者闭式胸膜腔引流的装置，下列错误的是A.
长玻璃口在水面下3cm
B.
短玻璃管与大气相通
C.
整个装置均须密封
D.
瓶距离引流口30cm
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举一反三
【单选题】— Do you want to study in the famous research institute? — Of course, anyone that _______ be chosen may be lucky. [ ]
A.
should
B.
could
C.
must
D.
may
【简答题】设当x=θ时，函数f（x）=sinx-2cosx取得最大值，则cosθ=______．
【简答题】At first the institute refused to purchase thetelescope, but this decision was _____ revised. A. occasionally B. consequently C. successively D. subsequently.
【简答题】设当x=θ时，函数f(x)＝sinx－2cosx取得最大值，则cosθ=______
【单选题】An unhappy childhood may have some negative effects on a person's character; however, they are not always ________. [ ]
A.
practical
B.
avoidable
C.
permanent
D.
beneficial
【单选题】测定下列金属污染物，水样保存时不能加酸酸化的是 。A. Pb2+ B. Cd2+ C. Cr6+ D. Hg2+
A.
Pb 2+
B.
Cd 2+
C.
Cr 6+
D.
Hg 2+
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