用于钢筋混凝土的水泥的氯离子含量不宜大于()%,用于预应力混凝土的氯离子含量不宜大于()%。
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The four strokes are called suction, compression, expansion and exhaust, but only () stroke provides the power to drive the ship.
A. suction
B. compression
C. expansion
D. exhaust
会计职业道德的表现形式既有明确的成文规定,也有不成文的规范,存在于人们的意识和信念之中。()
A. 正确
B. 错误