【单选题】The advantages of flash type evaporators, as compared to submerged tube type evaporators, include ______.
A.
less internal corrosion because of lower brine density
B.
higher temperature evaporation for lower salinity of the distillate produced
C.
less scale formation in a flash evaporator
D.
less feed-water required for a flash evaporator
【简答题】网络层又称为 ,主要完成 、 、 和 功能。
【简答题】网络层又称为____,主要完成____,____,____,____等功能。
【简答题】阅读教材P68-80,锉刀一般用 材料制成;按粗细规格,锉刀可分为: 、 和 三类;按尺寸规格,常用的锉刀可分为:100mm、 和 等。按截面形状的不同,锉刀可分为:圆锉、 和 、 等。
【单选题】Which of the following is NOT a feature of alternative tourism? ( )
C.
produce large amount of foreign exchange
D.
meet the needs of the special group with a higher-level of education and income