下列情况均可出现疟疾非典型发作的是：（）

A.恶性疟

B.成人输血后疟疾

C.婴幼儿疟疾

D.间日疟早期

E.混合感染

A solution to overcome tripping defects is an arrangement of special plates on either side of the flukes, designed to set them in the correct tripping position. These special plates are called（）.

A.trippers

B.stocks

C.awl

D.palms