工程造价的层次性取决于( )。
A．工程的层次性B．工程投资额C．工程复杂度D．影响造价的因素
参考答案：A
The number of the classes in our school is __________ than__________ of any other school in Nanjing．
A．1arger; it
B．more; that
C．1arger; that
D．more; it
乙炔属于易燃易爆气体，所以乙炔站的设置要特别处理好安全问题。
