He<br/>speaks English so fluently as if he ______ English in England. A: studied B: had<br/>studied C: would<br/>study D: should<br/>study

创建存储过程如下:<br/>Create<br/>procedure bookproc<br/>@id<br/>int, @title char(20) output<br/>As<br/>Select<br/>@title=title from book where id=@id<br/>执行该存储过程的方法正确的是()。 A: exec bookproc 1, @title output <br/>print<br/>@title B: exec bookproc @id=1, @title output <br/>print<br/>@title C: declare @title char(20)<br/>exec<br/>bookproc 1, @title output <br/>print<br/>@title D: declare @title char(20)<br/>exec<br/>bookproc @id=1, @title output <br/>print<br/>@title

Which<br/>of the following virus structure is derived from host cell membranes() A: nucleic<br/>acid B: capsid<br/>protein C: lipid<br/>bilayer D: sugar<br/>in spikes E: protein<br/>in spikes

The<br/>main factors affecting the selection effect are () A: The<br/>genetic composition of the population B: The<br/>size of the population C: Genetic<br/>characteristics of traits D: Selection<br/>criteria and accuracy of identification

Which of the following services is not provided by TCP? () A: Delay<br/>guarantees and bandwidth guarantees B: Reliable<br/>data transfers and flow controls C: Congestion<br/>controls D: In-order<br/>data transfers