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【多选题】
防己的性状特征为A.
表面淡灰黄色，弯曲处有深陷的横沟
B.
不规则圆柱形，屈曲不直
C.
质坚实，断面不平坦，灰白色
D.
，有稀疏的放射状纹理
E.
气微，味苦
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反馈参考答案：
举一反三
【多选题】等离子喷涂的主要特点是（ ）。
A.
等离子火焰温度可达到20000K，可熔化目前所有固体材料
B.
喷射出的微料的温度和速度都很高，故形成的喷射涂层结合强度高，质量好
C.
设备简单，操作方便
D.
价格便宜好用
【简答题】单个柱塞缸只能实现 运动。
【单选题】--- You look very tired. _____ at all last night? --- No, not really. I’m tired out now.
A.
Do you sleep
B.
Were you sleeping
C.
Did you sleep
D.
Had you slept
【单选题】Couples having infant children ______.
A.
are lucky since they can have a whole night's sleep
B.
find fun in tucking them into bed at night
C.
find more time to play and joke with them
D.
derive happiness from raising their children
【简答题】Do you know why you sleep? You may think it’s because you’re tired. Or perhaps you’ve been told sleep is good for you. Yet no one knows exactly why or how people sleep. Until the early 1950s, most sci...
【单选题】---May I speak to Mr. Smith? --- He __________. Can I ______ a message?
A.
is sleeping, take
B.
will sleep, take
C.
sleeps, bring
D.
is sleeping, get
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