X射线机辐射出X射线的能量用（）来度量。
参考答案：电压峰值
The boy is very fat ______ eating ______ food. [ ]
A. because; much too
B. because of; too much
C. because; much too
D. because of; much too
易燃流体是指闪点，等于或低于（）的液体。
A、45℃
B、50℃
C、60℃
D、以上均错误
