比a的2倍多3可以写作2a+3．______．（判断对错）
a×2+3=2a+3；
故答案为：√．
The boy did his homework with the help of his father in the past. But now he can do it alone.
A．for himself
B．on himself
C．by himself
D．with himself
咨询合同文本由雇主选用( )，并作为招标文件的一部分。
A．示范文本 B．自行编制C．标准格式或自行编制 D．格式文本
