角倍的形状是A．长方形 B．长圆形 C．菱角形 D．三角形 E．正方形

TCBS平板中缺少的成分是()

A．胆盐

B．蔗糖

C．亚硝酸盐

D．枸橼酸盐

E．硫代硫酸盐

In view of all sorts of rumors and guesses, experts carried out some careful and scientific research and         the possibility of a second earthquake in this area.

A．blamed

B．discounted

C．attended

D．charged

上颌窦癌放射治疗失败的主要原因是()

A.局部复发+淋巴结转移

B.局部复发+远地转移

C.淋巴结转移+远地转移

D.局部未控或局部复发

E.局部未控+远地转移

Stack is quite simple. Many computer systems have stacks built into their circuitry. They also have machine-level instructions to operate the hardware stack. Stack is ______ in computer systems.

A．useless

B．not important

C．simple but important

D．too simple to be useful

某进出口公司欲进口包装机一批，对方发盘的内容为：“兹可供普通包装机200台，每台500美元CIF青岛，6至7月份装运，限本月21日复到我方有效。”我方收到对方发盘后，在发盘规定的有效期内复电：“你方发盘接受，请内用泡沫，外加木条包装。” 问：我方的接受是否可使合同成立为什么