【单选题】甲亢患者甲状腺手术后发生甲状腺危象的主要原因是
【单选题】—__________? —He's a farmer. [ ]
A.
What is your father doing
B.
What does your father do
【单选题】When they returned to the river, they found that the boat had _______ away.
【判断题】开空调后,车厢门窗应关闭,以降低热负荷。
【单选题】梁的横截面可选用图示空心矩形、矩形、正方形和圆形四种之一,假设四种截面的面积均相等,荷载作用方向铅垂向下,承载能力最大的截面是: