投资体制改革规定，国家对我国企业到境外投资资源开发类和大额用汇项目实行( )。A．

用流体力学原理说明为什么当火车进站时，人们需稍微远离站台边缘。

计算：（2+1）（2²+1）（2⁴+1）…（2³²+1）+1=______．

用氟离子选择电极法测得某溶液E=290mV，相应的氟离子浓度为1.5mg／／L，已知其E与logC的直线斜率为59mV，测得另一溶液的E=349mV，其相应的氟离子浓度为

A.0.15mg／L

B.290mg／L

C.349mg／L

D.1.5mg／L

E.15.0mg／L

“北京2008年奥申委”确定的申办口号为“新中国、新北京”。( )

The mother of a 9-month-old asks about adding new foods to his diet. The child is being breast-fed and takes formula and cereal when at the sitter’s. Which of the following would the nurse instruct the mother to do（）

A. Mix new foods with formula or breast milk.

B. Mix new foods with more familiar foods.

C. Offer new foods one at a time.

D. Offer new foods after giving formula or breast milk.