‏人类基因组的碱基数目为‏ A: 3.0×10^9 bp B: 2.9×10^6 bp C: 4.0×10^9 bp D: 4.0×10^6 bp

【单选题】Supposethepriceindexwas100in2014,109in2015,andtheinflationratewaslowerbetween2015and2016thanitwasbetween2014and2015.Thismeansthat A. th e pric e inde x i n 201 6 wa s lowe r tha n 109.0 B. th e pric e inde x i n 201 6 wa s lowe r tha n 118.9 C. th e pric e inde x i n 201 6 wa s lowe r tha n 118.0 D. th e inflatio n rat e betwee n 201 5 an d 201 6 wa s lowe r tha n 1.0 9 percent

大型低速柴油机的最低起动转速范围，一般为（ ）。 A: n＝10—30 r／min B: n＝30—50 r／min C: n＝60—70r／min D: n＝80一150r／min

【计算题】他励直流电动机额定数据为:P N = 5.6kW,U N =220V,I N =28A,n N =1000r/min,测得电枢电阻R a =0.35Ω。试计算并画出机械特性曲线: (1)固有机械特性; (2)电枢回路串入R W =50%R N (R N =U N /I N )时的人为机械特性; (3)电枢电压降为U=50%U N 时的人为机械特性; (4)磁通为Φ=80%Φ N 时的人为机械特性

若A是n阶非零方阵，且R(A)=n-1，则R（A*）=[input=type:blank,size:6][/input]。

设A为m×n矩阵，B为n×，n矩阵，若AB=E，则( ) A: r(A)=m，r(B)=m B: r(A)=m，r(B)=n C: r(A)=n,r(B)=m D: r(A)=n，r(B)=n

求给定自然数m和n的最大公约数。请完善程序。 Private Sub Command1_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r Do r = m Mod n m = n n = r Loop Until__________ Text3.Text = m End Sub Private Sub Command2_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r r = m Mod n Do Until _______ m = n n = r r = m Mod n Loop Text3.Text =____ End Sub Private Sub Command3_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r Do r = m Mod n m = n n = r Loop While________ Text3.Text =______ End Sub Private Sub Command4_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r r = m Mod n Do While______ m = n n = r r = m Mod n Loop Text3.Text =____ End Sube73f1fd63959cc8362d8c82d419c2353.png

若设变压器初、次级线圈的匝比为N=N A: R=NR B: R=NR C: R=R/N D: R=R/N

S为细胞质不育基因，N为细胞质可育基因，r为细胞核不育基因，R为细胞核可育基因。下列杂交何者可产生雄性不育系（ ）。 A: S(r r) × N(RR) B: S(r r) × N(r r) C: N(R r) × S(r r) D: N(r r) × N(r r)

4 Complete the words. ► l u n g c a n c e r lung cancer 1 m _ m _ r _ l _ _ s s ____ 2 a r _ r _ t i c ____ 3 b r _ _ n ____ 4 b l _ _ _ ____ 5 s t r _ _ e ____ 6 h _ _ r t d _ s _ _ s e ____ 7 d _ s _ b _ l _ t y ____