带ABS的制动系，可采用哪种规格的制动液（ ）。 A: DOT　1 B: DOT　2 C: DOT　3 D: DOT 4

关于相对导数与绝对导数的关系，正确的是_____。 A: $\dot r = \tilde{\dot r}$ B: $\left| {{\bf{\dot r}}} \right| = \left| {{\bf{\tilde{ \dot r}}}} \right|$ C: ${\bf{\dot r}} = {\bf{\tilde{ \dot r}}}$ D: 以上都不正确

Dot

1 Before the interview, Mary should: ________________________ _______________________________________________________________________________________

Liu Yang felt 1 and 2 before take-off.

The crusades occurred_____ . A: mostly before the 14th century B: mostly before the 11th century C: in 1 147 D: in 1100

16. Usually speaking, when should we get to the airport for the international flight? A: 3 hours before taking off B: 2 hours before taking off C: 1 hours before taking off D: 40 mins before taking off

习题集p110零件图作业.dot

Your job interview is scheduled for 9 a.m. What time should you arrive? A: 1 minute before the interview begins. B: 30 minutes before the interview begins. C: 45 minutes before the interview begins. D: 10 minutes before the interview begins.

1) If you choose to invite your guests ____________, remind them again in writing ____________ before the gathering. 2) Six to eight months before an ________________ to which out-of-town ____________