40℃运动粘度小于100（不含100）的液压油外观颜色都比同粘度范围的内燃机油的颜色浅。
参考答案：对
That art center is ____ used to be a factory,_____ millions of cars were made．
A．what; which
B．where; where
C．what; where
D．where; which
附睾内探及无回声暗区，边界清楚，壁薄，后方回声增强，调高增益暗区内可见细小光点回声，属于（）
A.射精管囊肿
B.精液囊肿
C.精囊脓肿
D.精索静脉曲张
E.睾丸囊肿
