会阴侧切手术护理错误的是()。
A.嘱产妇取健侧卧位
B.手术后3d内冲洗外阴
C.密切观察伤口情况
D.伤口化脓应延期拆线引流
E.伤口肿痛可局部湿敷
参考答案:B
一般型等离子弧切割可采用转移型电弧或非转移型电弧,转移型电弧用来切割()。
A.高分子材料
B.金属材料
C.无机非金属材料
D.复合材料
—Who's that boy reading in the garden? Is it David?
—It ____be David. I saw him in the classroom just now. [ ]
A. must
B. can't
C. may
D. shouldn't