png的最优值是（） A: -2 B: -6 C: -45/4 D: -7
png的最优值是（） A: -2 B: -6 C: -45/4 D: -7
45、瓦斯爆炸的浓度界限约为（ ）。 A: 4~15% B: 5~16% C: 6~17%
45、瓦斯爆炸的浓度界限约为（ ）。 A: 4~15% B: 5~16% C: 6~17%
9号道岔的辙叉角是（ ）。 A: 6°25´20" B: 6°20´25" C: 4°45´49" D: 4°49´45"
9号道岔的辙叉角是（ ）。 A: 6°25´20" B: 6°20´25" C: 4°45´49" D: 4°49´45"
45 = () 弧度 A: π/4 B: π/2 C: π/6
45 = () 弧度 A: π/4 B: π/2 C: π/6
框架结构的合理层数，一般为( )层。 A: 4～8 B: 6～10 C: 4～15 D: 6～15
框架结构的合理层数，一般为( )层。 A: 4～8 B: 6～10 C: 4～15 D: 6～15
When does the plane take off（） A: 4:15 B: 4:05 C: 4:45
When does the plane take off（） A: 4:15 B: 4:05 C: 4:45
A buzzer sounds every 15 minutes．If the buzzer sounded at 12:40，which of the following could be a time at which the buzzer sounded（） A: 4:05 B: 5:30 C: 6:45 D: 7:15 E: 8:10
A buzzer sounds every 15 minutes．If the buzzer sounded at 12:40，which of the following could be a time at which the buzzer sounded（） A: 4:05 B: 5:30 C: 6:45 D: 7:15 E: 8:10
Quelle heure est-il ? A: 7 h 15 B: 7 h 30 C: 6 h 45 D: 6 h 30
Quelle heure est-il ? A: 7 h 15 B: 7 h 30 C: 6 h 45 D: 6 h 30
45°化成弧度数是( ) A: π/4 B: π/6 C: π/3 D: π/2
45°化成弧度数是( ) A: π/4 B: π/6 C: π/3 D: π/2
[听力原文]W: What time did yesterday’s basketball game startM: It was supposed to start at a quarter to 7, but it was delayed an hour. When did the game finally start（） A: 7:15 B: 7:45 C: 6:15 D: 6:45
[听力原文]W: What time did yesterday’s basketball game startM: It was supposed to start at a quarter to 7, but it was delayed an hour. When did the game finally start（） A: 7:15 B: 7:45 C: 6:15 D: 6:45