Java中线程模型由虚拟的CPU、代码和数据构成。该模型是由java.lang.__

“Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”

A．after

B．unless

C．until

D．when

经济越发达地位越高的产业是（）

A.第一产业

B.第二产业

C.第三产业

D.第四产业

根据《刑法》的规定，单位负责人对依法履行职责、抵制违反《会计法》规定行为的会计人实行打击报复，情节恶劣，构成犯罪的，处以有期徒刑或者拘役。有期徒刑刑期最高为( )年。

A．1

B．3

C．5

D．7

处在正弦交流电路中的负载，若电感负载占的比重越大，其功率因数就越高。（）

ARPU就是（），是电信运营企业客户最关键的特征指标。