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【单选题】
构成多核苷酸链骨架的关键是A.
2′，3′－磷酸二酯键
B.
2′，5′－磷酸二酯键
C.
2′，4′－磷酸二酯键
D.
3′，4磷酸二酯键
E.
3′，5′－磷酸二酯键
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反馈参考答案：
举一反三
【单选题】整体面层楼地面工程量计算时,应扣除的项目为( )
A.
600x500的管道井
B.
500x500的独立柱
C.
附墙柱(凸出墙面部分截面600x500)
D.
间壁墙
【单选题】How many years will it be before the world runs out of oil? The question is far from an academic exercise. This year oil hit a near record high of $40 a barrel, and Royal Dutch/Shell Group downgraded ...
A.
How long the oil age will last is simply an academic question.
B.
The oil price this year set a new record.
C.
Shell Group reduced its reserves to 4.5 billion barrels this year.
D.
Economists disagree with one another on how much oil you can realistically mine.
【单选题】Receptionist: Can I help you? Customer:______ Where do I pay my fees?
A.
Yes, please.
B.
Thank you.
C.
As you please.
D.
Yes, you can.
【单选题】患者感冒4天,经用解表剂后感冒好转,但出现心下痞满,噫气带有食臭味,腹中肠鸣,泻利,小便不利,舌淡苔白滑腻,脉弦滑,关脉弱稍沉。治疗用
A.
理中汤
B.
茯苓桂枝白术甘草汤
C.
小建中汤
D.
厚朴生姜半夏甘草人参汤
E.
生姜泻心汤
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