【单选题】The gold standard is ______.
A.
the average price of gold on the world market
B.
a basis for determining the value of currency
C.
the amount of gold required by a nation before its currency can be made convertible
D.
a means of determining the quality of gold
【简答题】变频器的逆变器是利用功率器件,有规律地控制逆变器中主开关的通断,从而得到
【单选题】以多种语言发表同一成果,以下说法正确的是()
【单选题】Excel 中,用来储存并处理工作表数据的文件,称为
【单选题】Meanwhile, with the price of gold______, SouthAfrica`s economy ( 经济 ) was god.
【单选题】According to the author, one of the reasons for the rising of gold price is ______.
A.
the increasing demand for gold
B.
the depreciation of the euro
C.
the link between the dollar and gold
D.
the Increment of the value of the dollar
【单选题】The price of diamond rings has risen sharply _______ the price of gold rings has gone down.
【多选题】以下关于非语言表达说法正确的是( )
B.
巡舱过程中,与旅客目光交汇时,乘务员应点头微笑作回应;
C.
沟通过程中,适当降低高度,保持目光平视,弯腰倾听;
D.
为给旅客提供更好的服务,应与旅客保持亲密距离。
E.
职业形象代表职业精神,乘务员在客舱中要时刻注意仪容仪表。
F.
服务过程中,邻座如有其他旅客,需与邻座旅客有目光交流;
【简答题】变频器中的逆变器是利用功率器件,有规律地控制逆变器中主开关的通断,从而得到任意()的三相交流输出。
【简答题】变频器的逆变器是利用功率器件,有规律地控制逆变器中主开关的通断,从而得到 ________频率的三相交流电输出。