【单选题】下列关于getElementsByTagName描述不正确的是( )。
【单选题】The common-base amplifier has ___.
A.
voltage gain, current gain, and power gain
B.
voltage gain and power gain, but no current gain
C.
current gain and power gain, but no voltage gain
D.
current gain and voltage gain, but no power gain
【判断题】人们根据种种迹象判断,在天王星之外一定还有一颗行星,全世界天文学家进行了长期观察和探寻,一直没有发现。后来,科学家们暂时避开直接搜寻,转入该未知行星的轨道计算,根据求得的轨道参数反推,人们很快便找到了这颗新星:海王星。运用的是创新学的移植原理
【单选题】On a common-base year financial statement, accounts receivables will be expressed relative to which one of the following?
B.
current year total assets
D.
base-year total assets
E.
base-year accounts receivables
【简答题】下列矿物不能作药用的是A.皮硝B.芒硝C.信石D.朱砂A. 1 B. 1 C. 1 D. 1