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【多选题】
波长色散X荧光光谱仪中用于探测重元素X射线荧光是（）计数器，用于探测轻元素X射线荧光是（）正比计数器，封闭式正比计数器是用于探测限定的几个元素的X射线荧光。A.
闪烁
B.
半导体
C.
流气式
D.
光电倍增管
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反馈参考答案：
举一反三
【简答题】committee
【单选题】This is my ____ school-bag.
A.
sister Mary
B.
sister's Mary
C.
sister's Mary's
D.
sister Mary's
【简答题】花瓶在桌子的上面，桌子在花瓶的（ ）。
【单选题】South Point Radio: Utopia. This is South Point Radio. What is your present position, course and speed? Utopia: South Point Radio. This is Utopia. My present position is five zero degrees zero one minu...
A.
49°40’N, 35°23’W
B.
50°01’N, 33°37’W
C.
49°40’N, 35°23’E
D.
50°01’N, 33°37’E
【简答题】My name is Bill. I 31_ __an English boy. I am eleven. This is my school. It is No.4 Middle School. I am 32 ____Class Two, Grade Seven. Jim is my good 33 ____ .He is an English 34 ____. My father and ...
【单选题】Euphoria: Utopia. This is Euphoria. What is your position? Utopia: Euphoria. This is Utopia. My position is four nine degrees four zero minutes north, three five degrees two three minutes west. My pos...
A.
49°40’N, 35°23’W
B.
50°01’N, 33°37’W
C.
49°40’N, 35°23’E
D.
50°01’N, 33°37’E
【简答题】作业14:制作花瓶模型 扭曲——花瓶.pptx
相关题目：
【单选题】This is my ____ school-bag.
A.
sister Mary
B.
sister's Mary
C.
sister's Mary's
D.
sister Mary's
参考解析：
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