确定单层厂房跨度的尺寸时,应符合模数协调的标准,当厂房跨度≤18m时,跨度尺寸应取扩大模数()数列。
A.12M
B.15M
C.30M
D.60M
参考答案:C
The concert ________ next Thursday and we will enjoy the best performance from the best pianist.[ ]
A. happens
B. breaks out
C. comes about
D. takes place
二极管的只要参数有哪几个?各有什么含义?