How many back vowels are there in English? What are they? 6, and they are /u:/, /u/, /ɔ:/, /ɔ/, /ɑ:/ and /ʌ/.
How many back vowels are there in English? What are they? 6, and they are /u:/, /u/, /ɔ:/, /ɔ/, /ɑ:/ and /ʌ/.
已知u=380√2sin（ωt+60°）V,该电压有效值和初始相位为（） A: U=380√2V,φ=60° B: U=380V,φ=60° C: U=380√2V,φ=6/π D: U=380V,φ=6/π
已知u=380√2sin（ωt+60°）V,该电压有效值和初始相位为（） A: U=380√2V,φ=60° B: U=380V,φ=60° C: U=380√2V,φ=6/π D: U=380V,φ=6/π
Purchasing a new production line will be a ______ deal for the company. (U6-A) A: tremendous B: forceful C: favorite D: profitable
Purchasing a new production line will be a ______ deal for the company. (U6-A) A: tremendous B: forceful C: favorite D: profitable
The old man did not seem to attach much importance ______ the question. (U6-A) A: to B: with C: toward D: fo
The old man did not seem to attach much importance ______ the question. (U6-A) A: to B: with C: toward D: fo
They claimed that ______ 1,000 factories closed down during the Covid-19 pandemic. (U6-A) A: sufficiently B: considerably C: approximately D: properly
They claimed that ______ 1,000 factories closed down during the Covid-19 pandemic. (U6-A) A: sufficiently B: considerably C: approximately D: properly
As he has ______our patience, we will not wait for him any longer. (U6-A) A: torn B: wasted C: exhausted D: consumed
As he has ______our patience, we will not wait for him any longer. (U6-A) A: torn B: wasted C: exhausted D: consumed
设全集U＝{x∈N*|x<6}，集合A＝{1,3}，B＝{3,5}，则∁U(A∪B)＝( )
设全集U＝{x∈N*|x<6}，集合A＝{1,3}，B＝{3,5}，则∁U(A∪B)＝( )
u＝－100sin（6πt＋10°）V超前i＝5cos（6πt－15°）A的相位差是（）。
u＝－100sin（6πt＋10°）V超前i＝5cos（6πt－15°）A的相位差是（）。
u=-100sin(6πt+10°)V超前 i=5cos(6πt-15°)的相位差是（ ）。
u=-100sin(6πt+10°)V超前 i=5cos(6πt-15°)的相位差是（ ）。
已知有电压u=-100sin(6πt+10°)V,电流i=5cos(6πt-15°)A,则u超前i的相位差是: A: 25° B: 95° C: 115°
已知有电压u=-100sin(6πt+10°)V,电流i=5cos(6πt-15°)A,则u超前i的相位差是: A: 25° B: 95° C: 115°