As for P.E., some school boards either ____________.
As for P.E., some school boards either ____________.
11 、 I think P.E. is ________ any other subject.
11 、 I think P.E. is ________ any other subject.
依次采用不同极性溶剂来提取药效成分应采取的极性顺序是( )。 A: H2O→CH3OH→EtOAC→CH2Cl2→P.E (石油醚) B: P.E.→CH2Cl2→EtOAC→CH3OH→H2O C: P.E.→H2O→CH3OH→EtOAC→CH2Cl2 D: P.E.→CH3OH→EtOAC→CH2Cl2→H2O
依次采用不同极性溶剂来提取药效成分应采取的极性顺序是( )。 A: H2O→CH3OH→EtOAC→CH2Cl2→P.E (石油醚) B: P.E.→CH2Cl2→EtOAC→CH3OH→H2O C: P.E.→H2O→CH3OH→EtOAC→CH2Cl2 D: P.E.→CH3OH→EtOAC→CH2Cl2→H2O
依次采用不同极性溶剂来提取药效成分应采取的极性顺序是( )。 A: H2O→CH3OH→EtOAC→CH2Cl2→P.E (石油醚) B: P.E.→CH2Cl2→EtOAC→CH3OH→H2O C: P.E.→H2O→CH3OH→EtOAC→CH2Cl2 D: P.E.→CH3OH→EtOAC→CH2Cl2→H2O
依次采用不同极性溶剂来提取药效成分应采取的极性顺序是( )。 A: H2O→CH3OH→EtOAC→CH2Cl2→P.E (石油醚) B: P.E.→CH2Cl2→EtOAC→CH3OH→H2O C: P.E.→H2O→CH3OH→EtOAC→CH2Cl2 D: P.E.→CH3OH→EtOAC→CH2Cl2→H2O
Are you interested in maths or English, Mike? ___. I prefer P.E.
Are you interested in maths or English, Mike? ___. I prefer P.E.
Advantages of taking physical education (P.E.) courses Advantages of taking liberal arts courses Disadvantages of majoring in liberal arts 三选一
Advantages of taking physical education (P.E.) courses Advantages of taking liberal arts courses Disadvantages of majoring in liberal arts 三选一
压杆欧拉公式的使用极限值λp为( )。 A: λp=E/σp B: λp=π E/σp C: λp=sqrt(E/σp) D: λp=π×sqrt(E/σp)
压杆欧拉公式的使用极限值λp为( )。 A: λp=E/σp B: λp=π E/σp C: λp=sqrt(E/σp) D: λp=π×sqrt(E/σp)
If ????P(H)=0.8,P(E)=0.2, P(E|H)=0.1, then P(H|E) is______ .
If ????P(H)=0.8,P(E)=0.2, P(E|H)=0.1, then P(H|E) is______ .
相同条件下,若产生主动土压力为E<sub>a</sub>、被动土压力为E<sub>P</sub>,所需挡土墙的位移量分别为Δa、Δp,则下列结论正确的是()。 A: E<sub>a</sub>>E<sub>P</sub>,Δa<Δp B: E<sub>a</sub>>E<sub>P</sub>,Δa>Δp C: E<sub>a</sub><E<sub>P</sub>,Δa<Δp D: E<sub>a</sub><E<sub>P</sub>,Δa>Δp
相同条件下,若产生主动土压力为E<sub>a</sub>、被动土压力为E<sub>P</sub>,所需挡土墙的位移量分别为Δa、Δp,则下列结论正确的是()。 A: E<sub>a</sub>>E<sub>P</sub>,Δa<Δp B: E<sub>a</sub>>E<sub>P</sub>,Δa>Δp C: E<sub>a</sub><E<sub>P</sub>,Δa<Δp D: E<sub>a</sub><E<sub>P</sub>,Δa>Δp
flower arranging A: p B: p C: p D: p E: p F: p
flower arranging A: p B: p C: p D: p E: p F: p