期货交易保证金的金额一般为合同总价值的()。
A.(A) 1%~3%
B.(B) 1%~5%
C.(C) 3%~5%
D.(D) 5%~15%
参考答案:D
—What's this in English?
—_____ a pencil.[ ]
A. This is
B. Its
C. It's
D. Is
人中胚叶造血从胚胎发育第几周开始()
A.1周末
B.2周末
C.3周末
D.4周末
E.5周末