【单选题】关于别构调节,正确的是
B.
别构酶的动力学特点是酶促反应与底物浓度的关系呈 S 形而不呈矩形双曲线
【单选题】We don't know ___ to pay a visit to the old town.
【单选题】In our town, we don't have taxis.
【单选题】关于变构调节正确的是
B.
变构酶的动力学特点是酶促反应与底物浓度的关系呈S形而不是双曲线
【单选题】在生产多种产品的条件下,不影响加权平均边际贡献率大小的因素有()
【单选题】We just walk around the town center, seeing __________ we can. [ ]
A.
as many of our friends as
B.
as much of our friends as
C.
as more of our friends as
D.
as most of our friends as
【简答题】某方案从第0年末到第5年末的累计净现值分别为-100、-81.8、-48.76、-11.48、22.96、54.01万元,该方案的动态投资回收期是______年。(答案保留2位小数)