以下舌下腺囊肿的治疗方法中正确的是
A．不能行袋形缝合术
B．抽出囊液
C．抽出囊液后注入碘酊
D．摘除囊肿及舌下腺
E．摘除囊肿
参考答案：D
The bus was due to __________ at 5 p. m.，but it arrived one hour late due to __________ by the heavy fog.
A．arrive; be held up
B．arrive; being held up
C．arriving; be held up
D．having arrived; having been held up
流量调节时应（）进行
A、快速
B、根据参数
C、缓慢
D、根据阀门
