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【单选题】
A public company with its share capital limited by guarantee is a popular business structure for which type of entity ?A.
Not-for-profit charity.
B.
Mining company.
C.
Investment company.
D.
Any of the above .
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【单选题】诊视床的叙述，哪组是错误的？
A.
遥控床是影像增强器， X 线电视与诊视床的组合体电动化程度高
B.
双支点滑块式诊视床， 0~90 °范围内回转速度慢，有利于造影检查
C.
一般诊视床，由驱动电机，各种控制开关，接触器等组成
D.
电动诊视床主要用于胃肠疾病的 X 线检查，也称胃肠床
【简答题】选词填空。 1. It's ______(rainy/rain) today. 2. London is _______(windy/wind) today. 3. It's ________(snow/snowy) in Beijing today. 4. It's _________(cloudy/cloud) in Lhasa today. 5. It's ________ ( sun/su...
【简答题】读一读，选词填空。 1. It's time ____________ (to / for) go to school. 2. It's time ____________ (to / for) go home. 3. What time ____________ (is it / are they)? 4. I can see two ____________ (clock / clocks)....
【简答题】选词填空。 lovely singing sunny children jumping eating swimming sad Today is Sunday. It's a 1. day. Many 2._ are in the park. They are looking at the animals. Look! The rabbit is 3. . The mon...
【单选题】关于双块式制动器,叙述错误的是( )。
A.
这种能实现机构断电制动、通电运转的制动器称为常开式制动器。在起重机械突然断电的情况下，常开式制动器使机构合闸制动，保证人身设备安全
B.
在电动机断电不工作时，松闸装置不通电，依靠弹簧、重锤或元件自重产生的作用力合闸制动，使机构速度降低直至停止
C.
在驱动机构的电动机通电工作的同时，制动器上的松闸装置通电推动制动杆松闸，使瓦块脱开制动轮，机构运转
D.
适用于需要正、反转的机构，如起重机的起升机构或运行机构
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