A．I'm working.B．I'm fine.C．I have no idea.D．I've got a cold. A: I'm working. B: I'm fine. C: I have no idea. D: I've got a cold.
A．I'm working.B．I'm fine.C．I have no idea.D．I've got a cold. A: I'm working. B: I'm fine. C: I have no idea. D: I've got a cold.
I’m _______ you’ve made the right choice.
I’m _______ you’ve made the right choice.
1 I'm tired. I___________for ten hours. A: 've been working B: 've worked C: work
1 I'm tired. I___________for ten hours. A: 've been working B: 've worked C: work
I’m afraid I’ve ________ a piece out of this saucer.
I’m afraid I’ve ________ a piece out of this saucer.
[音频]I've been ________________ , but I'm _________________ .
[音频]I've been ________________ , but I'm _________________ .
矩阵[left[ {egin{array}{*{20}{c}} {m{0}}&{m{0}}&{m{5}}&{m{2}}\ {m{0}}&{m{0}}&{m{2}}&{m{1}}\ {m{4}}&{m{2}}&{m{0}}&{m{0}}\ {m{1}}&{m{1}}&{m{0}}&{m{0}} end{array}} ight]]的逆矩阵为 ()
矩阵[left[ {egin{array}{*{20}{c}} {m{0}}&{m{0}}&{m{5}}&{m{2}}\ {m{0}}&{m{0}}&{m{2}}&{m{1}}\ {m{4}}&{m{2}}&{m{0}}&{m{0}}\ {m{1}}&{m{1}}&{m{0}}&{m{0}} end{array}} ight]]的逆矩阵为 ()
矩阵[left[ {egin{array}{*{20}{c}} { m{0}}&{ m{0}}&{ m{5}}&{ m{2}}\ { m{0}}&{ m{0}}&{ m{2}}&{ m{1}}\ { m{4}}&{ m{2}}&{ m{0}}&{ m{0}}\ { m{1}}&{ m{1}}&{ m{0}}&{ m{0}} end{array}} ight]]的逆矩阵为 （ ） </p></p>
矩阵[left[ {egin{array}{*{20}{c}} { m{0}}&{ m{0}}&{ m{5}}&{ m{2}}\ { m{0}}&{ m{0}}&{ m{2}}&{ m{1}}\ { m{4}}&{ m{2}}&{ m{0}}&{ m{0}}\ { m{1}}&{ m{1}}&{ m{0}}&{ m{0}} end{array}} ight]]的逆矩阵为 （ ） </p></p>
I've already told you that I'm going to buy it, ________.
I've already told you that I'm going to buy it, ________.
I'm sorry to __________ you __________, Mrs. Shaw, but I'm afraid we've run out of time.
I'm sorry to __________ you __________, Mrs. Shaw, but I'm afraid we've run out of time.
静力平衡条件()。 A: ∑F=0∑M≠0 B: ∑F=0，∑M=0 C: ∑F≠0∑M=0 D: ∑F≠0∑M≠0
静力平衡条件()。 A: ∑F=0∑M≠0 B: ∑F=0，∑M=0 C: ∑F≠0∑M=0 D: ∑F≠0∑M≠0