【多选题】鼠标是一种方便、灵活、可靠的输入设备,分为( )
【单选题】仔细阅读并选出划线单词的正确解释。()In order to communicate the value of products or services to customers and motivate customers to pay more for the value provided by these products or services if necessary.
【判断题】日本に住んでいる外国人の数として、ブラジル人が一番多い。
【单选题】.A machine has an investment cost of $60,000 at time 0. The present value (at time 0) of the expected net cash inflows from the machine over its useful life are:Discount ratePresent value of cash infl...
【单选题】关于晶格比热的德拜近似,那个说法是错误?
A.
拜近似模型计算得到的三维晶体中长声学声子对晶格比热的贡献正比于温度的三次方
B.
德拜近似模型假设长声学波的振动频率正比于波矢的一次方
C.
德拜模型计算得到的三维晶体的振动模式态密度函数正比于振动频率的平方
D.
德拜近似模型适用于讨论长波光学声子对比热的贡献
【单选题】关于晶格比热的德拜近似,那个说法是错误?
A.
德拜近似模型适用于讨论长波光学声子对比热的贡献
B.
拜近似模型计算得到的三维晶体中长声学声子对晶格比热的贡献正比于温度的三次方
C.
德拜近似模型假设长声学波的振动频率正比于波矢的一次方
D.
德拜模型计算得到的三维晶体的振动模式态密度函数正比于振动频率的平方
【单选题】The value of the industrial ____ dropped from about 70 billion dollars to slightly more than 31 billions.
【单选题】The effective rate of protection measures
A.
the "true" ad valorum value of a tariff.
B.
the quota equivalent value of a tariff.
C.
the efficiency with which the tariff is collected at the customhouse.
D.
the protection given by the tariff to domestic value added.