【单选题】按照 大小将混凝土的强度划分为不同的等级。
【单选题】With the rapid economic growth in China, the logistics industry is ()greatly
【单选题】During the expansion stroke, the piston is moving .
【单选题】_______ the company is not as successful as other big companies, it' s proven it can expand internationally.
【判断题】It is considered inefficient to use concept tests during the idea screening stage of the new-product development process.