21-三体综合征最常见的伴发畸形是()
A.消化道畸形
B.先天性心脏病
C.肾脏畸形
D.多指(趾)畸形
E.唇腭裂
参考答案:B
I don't know whether to stay in teaching or _____ another job.
A.trying getting
B.to try to get
C.trying to get
D.try get
对于双燃料发动机,当热机所需时间不正常地延长时,可能因为()有问题。