岩石的比重是岩石固体部分单位体积的重量,在数值上等于岩石固体颗粒的重量与同体积的水存( )℃时重量的比。
A.4B.5C.6D.7
参考答案:A
The manager ________ that the business would be worse after the stock (股票) went down. [ ]
A. talked
B. told
C. said
D. spoke
取源部件相邻测点间距应大于被测管外径,但不得小于()mm。
A、100
B、150
C、200