监理工程师可以随时指示承包商在工程的任何部位上检查，检查费用由承包商承担。( )
参考答案：错
Thousands of athletes _______ in many countries competed ________ medals in the 2008 Olympic
Games in Beijing. [ ]
A. will involve ; in
B. involving; by
C. involved; against
D. involved; for
天然气的热值一般约为多少？
A.13至20兆焦耳/立方米
B.21至32兆焦耳/立方米
C.33至40兆焦耳/立方米
