急性化脓性中耳乳突炎并发岩尖炎时可出现（）
A.动眼神经麻痹
B.外展神经麻痹
C.视神经萎缩
D.滑车神经麻痹
E.三叉神经痛
参考答案：B, E
_______ students in China are learning English at school.
A. Thousand of B. Thousands of C. Many thousand
一台1000VA的UPS功率因素0.8，带载能力是（）VA。
A.800
B.700
C.1000
D.900
