病原体由传染源体内排出后,侵入另一易感机体在外界环境中所经历的途径称为()
A.传播范围
B.传播途径
C.传播机制
D.传播地域
E.传播链
参考答案:B
用括号里所给词的适当形式填空。
Yesterday morning, I ____________ (get) up early. Because I ____________ (want) to ____________
(go) to fly a kite in the park. But it ____________ (is) raining. So I stayed at home and ____________ (do)
my homework. Today it is sunny. I ____________ (walk) to the park. I fly my kite in the sun. I ____________
(jump) and ____________ (laugh). I have fun today.
根据《中国电信全业务客户服务标准细目表(2010年版)》,钻石级客户排队等候时间必须()。
A.≤5分钟
B.≤8分钟
C.≤10分钟
D.≤15分钟