软件黑盒测试的测试用例设计主要考虑______。A．软件功能 B．输入数据 C．输出

下列物质中，含有氧分子的是   

A．O2

B．H2O

C．CO2

D．SO2

_____ help the people in the snowstorm in the south made him worried. [ ]

A. Not known how to

B. Unknown what to do to

C. His knowing not how to

D. His not knowing how to

通过绩效计划可以在公司内建立起一种科学合理地管理机制，能有机地将企业利益和员工个人利益（）在一起。

A.整合

B.结合

C.连接

D.连系

旋生叶序

候车厅标志有哪些？