建设工程项目履行合同的担保形式包括( )。
A.定金
B.抵押
C.保证
D.质押
E.预付金
参考答案:A,B,C,E
The reason why international trade is more costly is that a border typically imposes additional costs such as( ),time costs due to border delays and costs associated with country differences.
A.production
B.tariffs
C.capital
D.goods
在位运算中,操作数每左移一位,其结果相当于
A.操作数乘以2
B.操作数除以2
C.操作数除以4
D.操作数乘以4