下列哪几项必须定期检验,保证其精度?()
A、仪器
B、仪表
C、施工工具
D、施工材料
参考答案:A, B
The most important thing about cotton in history is ________ part that it played in _______ Industrial
Revolution. [ ]
A. /; /
B. the; /
C. the; the
D. a; the
图(A)所示多跨连续梁选用( )结构作为基本体系更为合理。
A.( 图(
B.( 图(
C.( 图(
D.( 都不合理