中耳病变可出现（）
A.传导性聋
B.感音性聋
C.神经性聋
D.混合性聋
E.中枢性聋
参考答案：A
看图判断正(√)误(×)。
( ) 1. We have a TV room.
( ) 2. We don't have a music room.
( ) 3. The art room is on the first floor.
( ) 4. The washroom is on the first floor.
( ) 5. The canteen is on the first floor, too.
( ) 6. We don't have a gym.
沿水平方向分别拉重1000 N和500 N的两辆车做匀速直线运动，若两车都前进10 m，且所用水平拉力都是200 N，设拉力对较重的车做功为W1，对较轻的车做功W2，则[ ]
A.W1＞W2
B.W1＜W2
C.W1=W2
D.无法判断
