酸轧车间破鳞拉矫机处排向大气中粉尘的最大含量不超过()
A.40mg/m3
B.20mg/m3
C.30mg/m3
D.10mg/m3
参考答案:C
—I think we should save the endangered animals.
— I agree _ you. There are not many of them. [ ]
A. to
B. with
C. about
妊娠期牙龈炎的致病菌是()
A.牙龈类杆菌
B.粘性放线菌
C.伴放线放线杆菌
D.梭形杆菌
E.中间型类杆菌