检查防水隔离层,其蓄水时间不少于()h。
A、12;
B、16;
C、24;
D、32。
参考答案:C
引起肾综合征出血热的病原是()。
A.汉坦病毒
B.登革病毒
C.新疆出血热病毒
D.黄热病毒
E.Lassa病毒
This cake is very sweet. You _________ a lot of sugar in it.
A.should put
B.could have put
C.might put
D.must have put