单项选择题

‌如图所示，各杆单位长度的重量为30N/m，载荷P=1000N，A处为固定端，B，C，D为铰链，根据前述对杆ABC受力分析的正确答案，列方程为（）
‌
‌

A．

B．

C．0
D．0

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问答题

Directions: Fill in the blanks in the sentences with the words given in the box. (1) speculate (2) adjust (3) invest (4) accelerate (5) imitate (6) thrust (7) protested (8) diagnosed (9) distinctive (10) preserve We might ______ further from the story and say that these people probably lived very close to the well because of the importance of water to life.

多项选择题

已知U=2V，I= -3A，下图中是电源的有（）？ A. 左一图 B. 左二图 C. 左三图 D. 左四图

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