【单选题】I wonder ______, Mr.Smith. We're looking for him everywhere. [ ]
A.
where has your son been
B.
where your son has been
D.
where your son has gone
【判断题】图示空间平行力系,设所有力作用线平行于Z轴,则此力系的独立平衡方程为
【简答题】A: Hello, this is Jane Smith of Sales Department. May I 1.______ to Mr. Green? B: I’m sorry. He is not 2._____ at the moment. A: When will he be back? B: He should be back at any 3. ______. A: I wonde...
【单选题】—Do you have any problems if you five minutes to read? —Well, I’m thinking about the new words. There are too many. [ ]
【判断题】瘤胃内 VFA 约 75 % 在瘤胃吸收,约 20% 经瓣皱胃吸收,约 5% 在小肠吸收 .