【单选题】Mr. Pontetlier felt extremely frustrated because______.
C.
his wife was indifferent to his talk
D.
his wife showed too much interest in his talk
【单选题】转叶式舵机结构的特点中,不正确的是_____。
B.
.普通转叶式舵机一旦内部发生蜜蜂损坏,无法在45°内将故障隔离回复操舵能力
【判断题】时间继电器是一种延时接通或断开的控制电器
【简答题】A.Some people didn't support him. B.Some people are jealous of him. C.His wife wanted him to give up his business. D.He has no confidence to run his business any more.
【多选题】关于土地的资源属性,下列描述正确的有( )。
【多选题】稀土是化学周期表中镧系元素和钪、钇共17种金属元素的总称,具有优良的光电磁等物理特性,能与其他材料组成性能各异、品种繁多的新型材料,称为工业黄金。关于下列中国稀土资源特征的描述正确的是
B.
我国稀土产量第一,销售量第一,60%至70%的稀土产品出口到国外
C.
全国稀土资源总量的98%分布在内蒙、江西、广东、四川、山东等地区
D.
2012年发布的《中国的稀土状况与政策》白皮书显示,我国稀土资源储量第一