—Sorry,I didn't.But now I know parking .
A:wasn't allowed
B:isn't allowed
C:won't allow
D:doesn't allow
如图所示:当S2和S3闭合,S1和S4断开时,电流流过的用电器是____;当S2闭合,S1、S3和S4断开时,电流流过的用电器是____,它们是____连接;当S1和S4闭合,S2和S3断开时,电流流过的用电器是____,它们是____连接.
(1)计算:2cos60°-2×12-1+-3+2-10;
(2)解方程:1x-2=1-x2-x-3.
Li Yang, the founder of Crazy English, says that he copies it down________he comes to a beautiful sentence.