【简答题】锆(Zr)元素是核反应堆燃料棒的包裹材料,二氧化锆(ZrO 2 )可以制造耐高温纳米陶瓷。我国有丰富的锆英石(ZrSiO 4 ),含Al 2 O 3 、SiO 2 、Fe 2 O 3 等杂质,生产锆的流程之一如下 (1)写出上述流程中高温气化的反应方程式(碳转化成CO):__________________ (2)写出ZrOCl 2 ·8H 2 O在900℃ 生成ZrO 2 的反应方程式_____...
【单选题】The correct statement about the generator’s paralleling off operation is ____.
A.
push the paralleling off button directly
B.
push the paralleling off button when the power is nearly zero
C.
transfer the load and then perform the paralleling off operation
D.
do nothing but just wait for paralleling off
【简答题】question 3 and 4 are based on the following news item
【单选题】The correct statement about the generator's paralleling off operation is _____
A.
push the paralleling off button directly
B.
transfer the load and then perform the paralleling off operation
C.
push the paralleling off button when the power is nearly zero
D.
do noting but just wait for parallelling off
【简答题】(14分)锆产业是极有发展潜力及前景的新兴产业,锆(Zr)元素是核反应堆燃料棒的包裹材料,二氧化锆(ZrO2)可以制造耐高温纳米陶瓷。我国有丰富的锆英石(ZrSiO4),含Al2O3、SiO2、Fe2O3等杂质,生产锆流程之一如下: 试回答下列问题: (1)写出上述流程中高温气化的反应方程式(碳转化成CO):_____________________________________________...
【单选题】关于晶体和非晶体,下述说法正确的是( ) 1晶体具有规则的几何形状 2晶体的物理性质与方向有关 3晶体有一定的熔点 4晶体内部分子的排列具有规律性
【单选题】齿轮传动时,由于接触表面裂纹扩展,使表面上小块金属脱落,形成麻点和斑坑,这种现象称为
【单选题】I’m planning a trip to the beach tomorrow, but still can’t decide _______.
【单选题】The correct statement about the generator’s paralleling off operation is ____.
A.
push the paralleling off button directly
B.
transfer the load and then perform the paralleling off operation
C.
push the paralleling off button whenthe power is nearly zero
D.
do nothing but just wait for paralleling off
【单选题】关于晶体和非晶体,下述说法正确的是 1单晶体具有规则的几何形状 2非晶体沿各个方向的物理性质都是一样的 3晶体有确定的熔点、非晶体没有确定的熔点 4晶体内部分子的排列没有规律性 ( )