渣线漏钢时，事故影响较小，包壁包底漏钢事故较大，钢包耳轴下部漏钢为（）事故。
A.轻微
B.重大
C.恶性
D.严重
参考答案：C
It is obvious to the students __________they should get well prepared for their future. [ ]
A. as
B. which
C. whether
D. that
下列给药途径适合膜剂的是（）
A.静脉推注
B.皮下给药
C.舌下给药
D.直肠给药
E.静脉滴注
