我国第一个针灸铜人铸造于哪个朝代
A.唐朝
B.宋朝
C.元朝
D.明朝
E.清朝
参考答案:B
To get as much firsthand information as possible, inspectors will hold workshops and distribute questionnaires, ____?
A.won't they
B.won't it
C.aren't they
D.isn't it
在脆性破裂岩石中,X型共轭节理的锐角和钝角分别是()。
A、30°和150°;
B、45°和135°;
C、50°和130°;
D、60°和120°。