鞘膜积液是指浆液积在（）
A.睾丸两层鞘膜之间
B.睾丸鞘膜和白膜之间
C.两层白膜之间
D.白膜与睾丸之间
E.睾丸与精索之间
参考答案：A
合理用药的基本原则？
If you must land on a beach with an oar-propelled lifeboat through a heavy surf，the recommended method is to（）.
A.keep the bow directly in toward the beach，and tow the sea anchor off the stern
B.ride in on the back of a large breaker
C.keep the bow into the seas with the sea anchor out over the bow，and row to meet the breaking waves
D.head directly into the beach by staying between the crests of the waves
