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【简答题】
I. Listen to the dialogues and tick the correct answers.
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【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
【简答题】Routine X-ray chest examination is not so erous___________
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