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【单选题】
柱塞泵是依靠（ ）在缸体内往复运动，使密封工作容积发生变化来实现吸、压油的。A.
活塞
B.
柱塞
C.
齿轮
D.
叶片
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举一反三
【单选题】Which word can NOT collocate with the verb "facilitate"?
A.
the performance
B.
the collaboration
C.
the development
D.
economic recovery
【简答题】A．subway B．Thursday C．nowadays D．x-ray
【简答题】普通混凝土的主要组成材料有哪些?各组成材料在硬化前后的作用如何?
【单选题】In connection with x-ray emission the symbol Kα refers to:
A.
an alpha particle radiation
B.
x-ray radiation from potassium
C.
x-ray radiation associated with an electron going from n = 2 to n = 1
D.
x-ray radiation associated with an electron going from n = 3 to n = 1
【单选题】Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when______.
A.
primary
B.
elementary
C.
necessary
D.
emergent
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