JTGE30-2005中规定，水泥砼的抗弯拉弹性模量是以（）抗弯拉强度时的加荷模量为准。
A.1/2
B.1/3
C.1/4
D.1.0
参考答案：A
---Have you heard of this new computer brand, Mike?
---Yes, of course and I’ve decided to buy _____.
A．it
B．one
C．this
D．that
天车安装超载限制器有何作用？
