外周血管痉挛性疾病可选用何药治疗
A．去甲肾上腺素B．肾上腺素C．多巴胺D．酚妥拉明E．普萘洛尔
参考答案：D
A．She attended one of its meetings.
B．Her roommate is a member of it.
C．She saw the members protesting.
D．She read about it in the newspaper.
已知（3+x）n的展开式中二项式系数之和为16，则n=______；设i为虚数单位，复数（1+i）n的运算结果为______．
