【判断题】金属在塑性变形过程中,随着变形程度的增加,强度、硬度增加,塑性、韧性下降的现象,称为加工硬化。
【单选题】在一次偶然的兴趣实验中,小军发现在氯酸钾中混入少量高锰酸钾后,加热时,混合物产生气体的速率,明显大于单独加热氯酸钾.以下兴趣小组同学针对这现象所提出的下列假设中,与结论较为一致的是( )
C.
只要是含氧的物质加入氯酸钾中,都可以加快氯酸钾的反应
【单选题】The public has complained that large quantities of waste water ______ into rivers without being
A.
11. The public has complained that large quantities of waste water ______ into rivers without being cleaned, so large amounts of money ______ to solve the problem. A.have poured; is needed
B.
has poured; are needed
C.
have been poured; is needed
D.
have been poured; are needed
【判断题】在冷塑性变形过程中随着变形程度的增加,金属的强度、硬度升高,而塑性、韧性会显著下降,这一现象称为加工硬化。
【单选题】That is the only way we can imagine ______ the waste of water in students’ bathroom.
【判断题】企业专设销售机构的固定资产修理费用应计入销售费用。
【单选题】参与经典激活途径的某补体成分,是一种单链的β球蛋白,被激活后极不稳定,易衰变,是补体系统中的一种自身调节机制,控制补体的激活过程,则这种补体成分是()
【单选题】使用“拉伸”命令创建形体的过程中,不能实现的操作是? ( )
【判断题】屋面板较正常的楼面板相比,除了有承重作用的要求,还要有维护和美观性的要求。
【简答题】Complete as frases com os verbos ter e haver no presente do indicativo. 1. ................ muitas farmácias nesta cidade. 2. A Rita ................ uma farmácia. 3. Hoje ................ um concerto...