文中______中最合适的措词是( )。A．茫然失措 B．无边无际 C．海底捞针

一项工程甲单独做要15小时完成，乙单独做要6小时完成，现在先由甲单独做8小时，然后乙加入合做x小时完成整个工程，则所列方程为( )

按要求完成下列各题。

1. Sam: How about trying the new French restaurant tonight?

   Tom: I heard it's very expensive. 

   Sam: Why don't we go Dutch? 

   Tom: Good idea!

    Read the dialogue, can you guess the meaning of "go Dutch"? You may answer it in Chinese. 

2. Sue is 5 years older than her younger brother Paul. Paul is 6 years older than Jim, the youngest in the family.

    If the total of the children's ages is 32, how old is the eldest child? 

3. What number should replace the question mark in the last circle? 

4. Which letter should appear in the final medal?

5. Look at the shapes and codes given. Work out the code which matches the shape given at the end of the line.

_____ unemployment and crime are high, it can be assumed that the latter is due to the former. [ ]

A. Before

B. Where

C. Unless

D. Until

在活塞面积一定的情况下，活塞或油缸克服外负载的能力，取决于进入油缸的油压力大小。

当初步设计有详细设备清单时，可直接按______编制设备安装工程概算。

A．概算指标法
B．扩大单价法
C．实物法
D．预算单价法