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【简答题】
若周期矩形信号f 1 (t)和f 2 (t)波形如图所示，f 1 (t)的参数为τ=0.5μs，T=1μs，E=1V；f 2 (t)的参数为τ=1.5μs，T=3μs，E=3V，分别求：
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举一反三
【单选题】Moon cakes, ________the moon, are round. [ ]
A.
look like
B.
looks like
C.
like
D.
likes
【多选题】Do you like eating moon cakes?
A.
Yes. Moon cakes are delicious.
B.
No. Moon cakes are too sweet and oily.
C.
Well, it depends.
【简答题】A．To gather under the moon, drink tea and eat moon cakes. B．To honor their ancestors and their mother country. C．To enjoy the full moon at night in August. D．To have family get together.
【简答题】4×39×25=（□×□）×39，a×□=35×□。
【单选题】After dinner we sit outside to() the full moon and the moon cakes.
A.
enjoy
B.
like
C.
love
【简答题】296÷39，把39看做（ ）试商。
【简答题】在横线里填“＞”或“＜”． 49÷0.t______49&n39p;&n39p;&n39p;&n39p;4.6______4.6÷0.7&n39p;&n39p;&n39p;&n39p;63÷0.9______63÷1.1 49÷1.t______49&n39p;&n39p;&n39p;&n39p;4.6______4.6÷1.4&n39p;&n39p;&n39p;&n39p;63÷t.7_____...
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