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【单选题】
临床研究证据按其来源可分为A.
前瞻性研究和回顾性研究
B.
试验性研究和观察性研究
C.
定性和定量研究 ’
D.
原始研究和二次研究
E.
病因、诊断、治疗和预后研究
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【单选题】Many buildings ____ in the past few years.
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were built
B.
were building
C.
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D.
had been built
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A.
which
B.
that
C.
where
D.
in which
【单选题】对于键盘事件类KeyEvent，下列哪一项是不正确的（）
A.
监听器为KeyListener
B.
监听器有三个抽象方法，处理不同的键盘事件
C.
主要有键按下，键抬起，击键（按下+抬起）三类事件
D.
对一次击键，监听器只能选择处理一种事件
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【单选题】Many tall buildings _______ in Shengsi in the past few years.
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A.
抑制细菌细胞壁的合成
B.
改变胞浆膜的通透性
C.
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D.
抑制细菌叶酸的合成
E.
抑制细菌DNA的复制
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