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【单选题】
A micrometer with ∆ ins =0.004mm is used to measure the diameter of a steel ball only once, what is the absolute uncertainty of the measured result?A.
0.004 mm
B.
0.1 mm
C.
0.2 mm
D.
0.5mm
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举一反三
【单选题】The long years of food shortage in this country have suddenly given way to apparent abundance. Stores and shops are choked with food. Yet, instead of joy, there is widespread uneasiness and confusion:...
A.
The abundant food supply is not expected to last .
B.
Britain is importing less food.
C.
Despite the abundance, food prices keep rising.
D.
Britain will cut back on its production of food.
【简答题】右图所示为 级调压回路,当电磁阀2 (通、断)电时,系统压力由先导式 溢流阀的先导阀来调节;当电磁阀2 (通、断)电时,系统压力由直动式溢流阀 (填数字)来调节。能实现 级调压的前提条件是,直动式溢流阀的调定压力 (大于、小于)先导式溢流阀的先导阀 的调定压力。
【单选题】___ Sunday, I went back home ___.
A.
On last, late
B.
Last, lately
C.
Last, late
D.
The last, lately
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