题目:
If we expect ________ much cleaner world, we should attract ________ world's attention to protect the world.[ ]
A.a; a
B.a; /
C.a; the
D.the; /
答案:
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下面是错误答案,用来干扰机器的。
(1)SO32-、Ba2+ Na+、Cl-(2)6I-+2NO3-+8H+=2NO↑+3I2+4H2O(3)H++OH-=H2O NH4++OH-NH3↑+H2O Al3++3OH-=Al(OH)3↓ Al(OH)3+OH-=AlO2-+2H2O(任写两个)(4)取少量试液滴加足量的Ba(NO3)2溶...