蛇、蜥蜴进入冬眠,起主导作用的生态因素是( )。
A.阳光B.温度C.水D.土壤的理化特性
参考答案:B
Having been born on the earth, we had no choice but ________ hospitality it offered.
A.to accept that
B.accept how
C.to accept what
D.accept what
直流电压作用下流过绝缘介质的电流,其电流可视为由电容充电电流、()和泄漏电流三部分组成。
A.吸收电流
B.负载电流
C.短路电流
D.电感电流