有“日光城”之称的城市是[ ]
A.青海的西宁
B.新疆的乌鲁木齐
C.西藏的拉萨
D.甘肃的兰州
答案:C
I made the ______ that he was coming, so I was surprised when he didn't show up.[ ]
A. demand
B. enquiry
C. reservation
D. assumption
干燥失重测定法是测定()。
A.不溶性杂质
B.遇硫酸易碳化的杂质
C.水分及其他挥发性物质
D.有色杂质
E.硫酸盐杂质