脂肪变性

二次函数y=3（x+1）²-5的图象的顶点在第______象限．

轮对在车床上卡装，加工和校对的基准是（）。

A.两轴颈中心线

B.两轮座中心线

C.两中心孔中心线

D.轴身中心线

服务X是服务Y的替代品，若服务X的价格下降，则服务Y的需求通常将（）

A.上升

B.不变

C.不确定

D.下降

E.先下降后不变

诊断淋菌性 * * 炎最常用的检查方法是（）

A. * * 分泌物做普通培养

B.PCR找淋球菌核酸

C. * * 分泌物染色涂片找淋球菌

D.血RPR试验

E. * * 分泌物涂片有大量白细胞

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

53().

A.bridges 

B.camps 

C.refers 

D.casts