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【简答题】
Although secondary education is ________, parents are not required to send their children to state schools. 2. The economic situation has been worsening, causing economists to ________ whether the present policies are sustainable. 3. He was found guilty and was ________ in the Tower of London, where he died very quickly, aged only 47. 4. It is obvious that the future of the Internet is to ________ more and more areas of the world, and that e-commerce and e-entertainment are going to go for more and more markets. 5. However, your current losses should soon be ________ by gains; the fund will produce a positive return of 11.6 percent over a nine-month period. 6. Because she was so tall and slim, all the clothes looked marvelous on her and the other girls would ________ their envy. 7. This can be a helpful approach in discussion – someone may regard you as ________ since you never want to change your mind, whereas you see yourself as determined. 8. On weekends, the school parking lot is almost empty except that a few cars ________ near the entrance. 9. In the photographer's finest pictures there is also a degree of ________, which allows them to be interpreted in a variety of ways. 10. Tim stretched out a hand in apology for his thoughtless remarks and was ________ by a firm handshake from Mark.
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【单选题】下列泵中理论流量与排出压力有关的是________。
A.
往复泵
B.
叶片泵
C.
螺杆泵
D.
离心泵
【单选题】往复泵的理论排量与泵的什么有关?
A.
工作压力
B.
容积效率
C.
泵缸结构尺寸
D.
转速
【单选题】往复泵的理论 排量 与泵的 有关。
A.
工作压力
B.
容积效率
C.
泵缸结构尺寸
D.
转速
【多选题】往复泵理论流量只与泵缸或活塞的()及每一周期内吸排液次数等有关。
A.
冲程
B.
截面积
C.
阀开度
D.
往复频率
【简答题】什么是粒子数反转?什么情况下能实现光的放大?
【单选题】子宫收缩力的特点,正确的叙述是
A.
每次收缩由强到弱,逐渐消失
B.
宫缩时胎盘血液循环不受影响
C.
宫缩起点在子宫底部
D.
上段收缩力强,向下逐渐减弱
E.
收缩时肌纤维拉长变细
【简答题】上面是SCR程序中的第一条指令,完成的是当PLC启动时,由____触发置位S0.0的指令执行,当S0.0被置位为1后,初始步被激活,才能进入该工作周期,并开始循环。
【简答题】下面哪一组符号全是关系运算符( )。A. B. C. D.
【多选题】考虑双动活塞式往复泵的理论平均流量,如下各项中,与其有关的有()
A.
活塞往复的频率 和活塞的位移
B.
活塞 的截面积
C.
吸、排液管的直径
D.
活塞杆的截面积
【多选题】考虑双动活塞式往复泵的理论平均流量,如下各项中,与其有关的有()
A.
活塞往复的频率 和活塞的位移
B.
活塞 的截面积
C.
吸、排液管的直径
D.
活塞杆的截面积
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