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【单选题】
质点作圆周运动,如果知道其法向加速度越来越小,则质点的运动速度 ( )
A.
越来越小
B.
越来越大
C.
大小不变
D.
不能确定
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【单选题】女衬衫的前肩斜比值是
A.
15:2.5
B.
15:3
C.
15:6
D.
15:4
【单选题】Why is juice as fat as fruits? ______
A.
The impact is antioxidant on disease risk may be more important that the amount of fiber.
B.
Whole fruits and vegetable have more fiber than most juices, and fiber has many benefits.
C.
It guarantees you to take in calories, and it help regulate blood sugar.
D.
Some juice companies are extracting the pulp ( which adds to the fiber).
【单选题】下列状态中不是基态的是 ( )
A.
通常条件的气体H2
B.
氟原子中有5个3p电子
C.
氧原子的电子结构为1s22s22p4
D.
氢原子中电子处在n=1的状态
【单选题】The author may agree ______.
A.
special hardware interfaces are often built into I/O devices
B.
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C.
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D.
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A.
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B.
N
C.
NG
【多选题】一般一个简单控制系统由以下选项中哪些组成()
A.
检测/变送装置
B.
被控对象
C.
干扰因素
D.
执行机构
【单选题】Standage suggests that tea may have been more responsible than rum for the independence movement in Britain's American colonies.
A.
Y
B.
N
C.
NG
【单选题】单回路控制系统的构成、主要特点及其应用场合,下面哪种说法不正确?
A.
由被控对象、测量变送装置、控制器、执行器四个基本环节组成
B.
结构简单、投资少、易于调整、投运、又能满足一般生产过程的工艺要求
C.
只对一个被控参数(被控量)进行控制的单闭环反馈控制系统
D.
适用于被控过程的纯滞后与惯性大、负荷与干扰变化大或者工艺要求高的场合
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A.
空腹
B.
安静
C.
等热范围
D.
睡眠
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