阴极振打是采用微机控制顶部电磁锤振打清灰方式。（）
参考答案：对
Soft drinks _______ to children for free in some restaurants on Children’s Day.
A．offer
B．have offered
C．are offered
D．will be offered
下列较少并发感染性休克的疾病是（）
A.急性菌痢
B.流脑
C.乙脑
D.革兰阴性杆菌败血症
E.流行性出血热
