锁骨产伤骨折的最佳治疗方案是A．不须特殊治疗 B．切开复位克氏针固定 C．8字绷带固

被减数是80，减数是50，差是多少？

—What made little Tony so unhappy and cry in his room?

— ______ to go hiking with his brother.

A．Having not been allowed

B．Not having allowed

C．Having not allowed

D．Not having been allowed

客户持缴款单来柜台办理现金缴存，只填写了小写3840.70。大写可以为（）。

A.叁仟捌佰肆拾元柒角整

B.叁仟捌佰肆拾元零柒角整

C.叁仟捌佰肆拾元柒角零分

D.叁千捌百肆拾元零柒角整

异步通信和同步通信各有什么特点？

著作权人寄给图书出版者的两份订单（）内未得到履行，视为脱销

A.6个月

B.9个月

C.12个月

D.10个月