问题
单项选择题
From this amount you need to()something to cover utility bills.
A.contribute
B.attribute
C.subtract
D.contract
答案
参考答案:C
From this amount you need to()something to cover utility bills.
A.contribute
B.attribute
C.subtract
D.contract
参考答案:C
右表是元素周期表的一部分。X、Y、Z、W均为短周期元素,X、W的质子数之和为23。下列说法正确的是 ( )
X | Y | ||
Z | W |
A.原子半径:W>Y
B.氢化物的稳定性:Y<Z
C.最高价氧化物对应水化物的酸性:W>Z
D.Z的氧化物不能溶于Y的氢化物的水溶液