国际市场上最早出现的期货品种是()。
A.外汇期货
B.黄金期货
C.谷物期货
D.石油期货
参考答案:C
以下位置是骨髓穿刺部位的是:()
A.髂后上棘
B.髂前上棘
C.胸骨柄
D.脊椎棘突
E.桡骨小头
The invention of the computer has increased the speed of word processing, thus making possibly the rapid growth of the publish business.