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【单选题】
关于主振型矩阵和正则振型矩阵下列说法错误的是（）。A.
将主振型矩阵的各列除以其对应主质量的平方根，得到的振型就是正则振型
B.
不同阶主振型是正交的
C.
将主振型矩阵的各列除以其对应主刚度的平方根，得到的振型就是正则振型
D.
以 n 个自由度系统为例，其主振型矩阵是一个 的方阵
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【简答题】编制试算平衡表时，也应包括只有期初余额而没有本期发生额的账户。（ ）
【单选题】--- The soup smells ___. We can’t wait to have it. - Of course, my mother cooked it ____.
A.
good, good
B.
well, good
C.
well, well
D.
good, well
【单选题】Mother Nature Shows Her Strength Tornadoes (龙卷风) and heavy thunderstorms moved across the Great Lakes and into Trumbull County on Saturday evening. The storms were dramatic and dangerous. George Snyde...
A.
Right
B.
Wrong
C.
Not mentioned
【多选题】Hurricanes and Tornadoes (飓风和龙卷风) : ______________________
A.
Use storm shutters to protect windows and glass
B.
Stay in your auto mobile if you are traveling.
C.
Turn the television and computers off to avoid damage or fire
D.
When you feel the electrical charge, drop to the ground immediately.
E.
Don ’ t use the telephone during a storm
F.
Have hurricane straps installed to keep the roof attached to the wall.
【单选题】Mother Nature Shows Her Strength Tornadoes (龙卷风). and heavy thunderstorms moved across the Great Lakes and into Trumbull County on Saturday evening. The storms were dramatic and dangerous. George Snyd...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】??Motber Nature Shows Her Strength?? ?? ????????Tornadoes(龙卷风) and heavy thunderstorms moved across the Great Lakes and into TrumbullCounty on Saturday evening: The storms were dramatic and dangerous....
A.
Right
B.
Wrong
C.
Not mentioned
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