变压器电流速断保护的优点有()。
A、可以保护变压器的高低压测
B、可以保护变压器高压侧线圈和电源侧套管
C、接线简单、动作迅速
D、保护范围不受限制
参考答案:B, C
对咽壁纤维层的描述不包括()。
A.主要由咽颅筋膜构成
B.介于粘膜和肌层之间
C.上薄下厚
D.两侧的纤维组织在后壁正中线上形成咽缝
E.上端接颅底
Do you know ______________ had reported the accident to the police?
A.who it was that
B.who was it that
C.it was who that
D.that it was who