胸部肿块的X线平片检查方法是（）。
A.胸部正侧位片
B.胸部双斜位片
C.胸部前弓位片
D.胸部左前斜位片
E.胸部右前斜位片
参考答案：A
计算（-2x2）3的结果是（ ）
A．-8x6
B．-6x6
C．-8x5
D．D-6x5
Scientists have discovered that the moon stores great ______ fuel that can solve the earth's energy problem. [ ]
A. numbers of
B. masses of
C. deals of
D. many of
