A:合金的熔点一般比组分金属低
B:铝钠合金若投入一定量的水中可得无色溶液,则n(Al)≤n(Na)
C:铝钠合金投入到足量氯化铜溶液中,会有氢氧化铜沉淀也可能有铜析出
D:若m g不同组成的铝钠合金投入足量盐酸中,放出的H2越多,则铝的质量分数越小
判断下列句子是否与短文相符。
Hello! My name's Tom. I'm nine. Today is my birthday. I have two gifts. The robot is from my father and the doll is from my grandmother. I like my birthday gifts very much. The robot is super. It can,walk. It is red and black. Touch it, it's hard. The doll is beautiful. It is,pink and white. Touch it, it is soft.
若含有4条多肽链的某蛋白质分子由n个氨基酸组成,那么它具有的肽键个数和氨基的最少个数分别是()
由曲线y=x2-2x与直线x+y=0所围成的封闭图形的面积为( )