【单选题】Approval of a foreign investor’s investment application is normally provided in “letter form,” rather than in a formal investment agreement, for which of the following?
A.
Proposals in which the investor is required to make some concession.
B.
Proposals that ask the host state to grant an investment incentive.
C.
Proposals that do not ask the host state for any investment incentives.
【简答题】在平面直角坐标系 xOy 中,直线 l 的参数方程为 ( t 为参数),它与曲线 C :( y -2) 2 - x 2 =1交于 A 、 B 两点. (1)求| AB |的长; (2)以 O 为极点, x 轴的正半轴为极轴建立极坐标系,设点 P 的极坐标为 ,求点 P 到线段 AB 中点 M 的距离.