在举办剪彩仪式时，剪彩人多是（ ）
A．普通大众
B．秘书人员
C．仪式主持人
D．在场的最高领导人
参考答案：D
These achievements_______ without the contribution of Qian Xuesen, a key leader of the New
China's nuclear, missile and so on. [ ]
A. would have been unthinkable
B. would not be unthinkable
C. would be unthinkable
D. would not have been unthinkable
某城市污水处理厂，每天从其二沉池排出的含水率为99.2%的剩余污泥为3000m3，经重力浓缩后，污泥含水率下降到96%，该厂每天浓缩后需经脱水处理的湿污泥的体积是( )。
A．(A) 400m3
B．(B) 600m3
C．(C) 800m3
D．(D) 1000m3
