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【单选题】
第 13 题(本题:1分) 以下选项中能表示合法常量的是A.
1,200
B.
1.5E2.0
C.
'\'
D.
"\007"
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举一反三
【单选题】Young pilots should doing too many new things in one flight.
A.
deny
B.
consider
C.
enjoy
D.
avoid
【简答题】实验题 在探究二力平衡条件的实验中: (1)如图甲所示,水平放置的实验装置中,将系于小车两端的线挂上钩码,分别跨过两定滑轮,使作用在小车上的两个拉力方向相反,并通过调整钩码 来改变拉力的大小.当小车平衡时,将小车水平转过一个角度,松手后小车不能保持平衡,这样的操作是为了探究相互平衡的二力是否 作用在 . (2)如图乙所示,A、B小车内装有电磁铁,电磁铁的通、断电可遥控实现,当通电时,A、B 小车合...
【单选题】I. Read the following statements and choose the correct answer.Psychologist George Spilich and colleagues at Washington College in Chestertown, Maryland, decided to find out whether, as many smokers s...
A.
smokers should not expect to become airline pilots
B.
smoking in emergency cases causes mental illness
C.
no airline pilots smoke during flights
D.
smokers may prove unequal to handing emergency cases
【单选题】药物相互作用是指同时或相继使用两种或两种以上药物时,其中一个药物作用的大小、持续时间甚至性质受到另一种药物影响而发生明显改变的现象。“服用四环素类抗生素时应避免与含金属离子和抗酸药如碳酸钙等同时服用,以免降低抗生素的活性”是属于()方面的相互作用。
A.
药代动力学
B.
药效动力学
C.
药物在体外
D.
两药互不干扰
【简答题】在探究二力平衡条件的实验中: (1)如图甲所示,水平放置的实验装置中,将系于小车两端的线挂上钩码,分别跨过两定滑轮,使作用在小车上的两个拉力方向相反,并通过调整 来改变拉力的大小.当小车平衡时,将小车水平转过一个角度,松手后小车不能保持平衡,这样的操作是为了探究相互平衡的二力是否 上 . (2)如图乙所示,A、B小车内装有电磁铁,电磁铁的通、断电可遥控实现,当通电时,A、B 小车合成一体. 为了探...
【单选题】I. Read the following statements and choose the correct answer.Psychologist George Spilich and colleagues at Washington College in Chestertown, Maryland, decided to find out whether, as many smokers s...
A.
smokers may prove unequal to handing emergency cases
B.
smokers should not expect to become airline pilots
C.
smoking in emergency cases causes mental illness
D.
no airline pilots smoke during flights
【单选题】Young pilots should ______ doing too many new things in one flight; i.e. do not fly a new type of aircraft on an unfamiliar airfield.
A.
avoid
B.
manage
C.
decrease
D.
deny
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