仔兔出生后皮肤多处出现粟粒大小的脓肿应怀疑（）。
A.兔瘟
B.兔葡萄球菌感染
C.兔巴氏杆菌
D.兔支原体感染
参考答案：B
This is his only request that the room __________ after being used.
A．be cleaned
B．would be cleaned
C．is cleaned
D．will be cleaned
背河抢护管涌，当缺少沙石料和土工织物时，可就地取材修做（）压（铺）盖。
A.梢料反滤
B.黏土
C.复合土工膜
D.土工膜
