新形势下提高党的领导水平和执政水平,面临的四种考验是市场经济考验和()。
A、外部环境考验
B、改革开放考验
C、执政考验
D、稳定考验
参考答案:A, B, C
Excuse me for _____ in without ______.
A.coming, asking
B.coming, being asked
C.to come, asking
D.to come, being asked
前后腭杆间的距离应大于()。
A.5mm
B.10mm
C.15mm
D.20mm
E.25mm