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【单选题】
下面关于“回收站”的描述，正确的是( )A.
“回收站”中的文件暂存在内存中，关机会丢失
B.
删除的软盘和硬盘文件都保留在“回收站”中，一旦需要可以恢复
C.
在“资源管理器”中删除一些无用文件，可以增加硬盘可用空间
D.
在“回收站”中删除一些无用文件，可以增加硬盘可用空间
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.
A.
dispose
B.
dissolve
C.
heat
D.
dissipates
【单选题】Bottom blow valves are installed on auxiliary water-tube boilers to ___________.
A.
completely drain the boiler in an emergency
B.
prevent sludge from forming in the drum
C.
remove floating impurities from the boiler water surface
D.
remove settled solids from the water drum
【单选题】Auxiliary boilers can be classified as .
A.
water-tube natural circulation boilers
B.
fire-tube boilers
C.
water-tube forced circulation boilers
D.
all of the above
【多选题】混凝土浇筑过程中应注意的事项主要有( )。
A.
混凝土运输、浇筑及间歇时间的总和应小于其初凝时间
B.
为了保证大体积混凝土的整体性，不宜分层浇筑
C.
施工缝处二次浇筑时，应在初凝时间内进行
D.
减少水泥用量，掺加粉煤灰可防止大体积混凝土产生裂缝
E.
采用机械振捣混凝土早期强度较低
【单选题】Bottom blow valves are installed on auxiliary water-tube boilers to _____.
A.
remove suspended and precipitated solids from the boiler water
B.
completely drain the boiler in an emergency situation
C.
prevent hardened scale deposits in the water drum
D.
remove floating impurities from the oily water surface
【简答题】可用性的三个目标是:有效性,效率,()。
【单选题】During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates ____ beside to see what would happen.
A.
were standing
B.
stood
C.
standing
D.
to stand
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