用于国际间硬度值比对的高稳定、均匀性好的硬度块，能够起到( )的作用。A．国际基准

_____ of danger in the street at night, she had to go home with a friend _____ her.

A．Being warned; accompanied

B．Having warned; accompanying

C．Warning; accompanying

D．Having been warned; accompanying

用possess, own或have的适当形式填空。

1.  We___ a dinner party on for tomorrow evening. 

2.  She__ herself of the unclaimed goods. 

3.  Daisy____ a chain of restaurants though still young.

4. We all like to attend Professor Zhang's lecture because he ____great tact.

心脏破裂最常见的部位是（）

A.右心室

B.左心房

C.右心房

D.左心室

E.全心

_____ great scientist Qian Xuesen is!

A．How

B．How a

C．What

D．What a

1GBT有取代（）的趋势。

A、GTR

B、GTO

C、VDMOS

D、SITH