子宫内膜癌最典型的临床症状为（）
A.绝经后 * * 出血
B.接触性出血
C.不规则 * * 流血
D.月经量过多
E.血性白带
参考答案：A
Parents should take seriously their children’s requests for sunglasses _______ eye protection is necessary in sunny weather.
A．because
B．through
C．unless
D．if
何为曲柄摇杆机构？
