倒泵时，关小准备停用泵的出口阀门，控制好排量，注意（）的变化情况。
A、泵体
B、周围安全
C、电压
D、压力等参数
参考答案：D
It was unbelievable that the fans waited outside the gym for three hours just ________ a look at the sports stars.
A．had
B．having
C．to have
D．have
诊断V征，眼球上下各转25°时斜视度差应是（）
A.≥10△
B.≥15△
C.≥20△
D.≥25△
E.不确定
