题目内容
（请给出正确答案）
提问人：网友xueqinhe
发布时间：2022-01-07
[主观题]
将andare虚拟式现在时变位补充完整：io vada, tu vada, lui/lei vada, noi andiamo, voi andiate, loro （).
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A and B are married, and had one house property registered under A’s name. B borrowed 1 million yuan from C and concealed this fact to A. B mortgaged the house to C. When B signed the mortgage contract and registered the mortgage, B illegally used A’s signature and signed for A. Now, A claims that the loan and mortgage contract are invalid. Which of the following is correct? A、 The mortgage contract is invalid. B、 The loan contract is invalid. C、 A has an obligation for the repayment of 1 million loan because he has joint liability. D、 A may plea for revoking of C’s right to mortgage.
and 
, respectively. If these two systems are in parallel connection, then the impulse response of the overall system 
is ( ).
