In a syllable, the nucleus + coda constitute the sub-syllabic unit r__________.

如图所示事故树的最小割集为（）。[img=171x267]17d608e17919de1.png[/img] A: {x1,x3},{x3,x4},{x1,x4,x5} B: {x1,x3},{x3,x4},{x1,x5},{x2,x4,x5} C: {x3,x4},{x1,x5},{x2,x4,x5} D: {x2,x3},{x1,x4},{x2,x4,x5}

2022-07-26 问题

直流并励电动机的电势平衡方程式可写成（）。 A: AEa=U+IaRa B: BEa=U-IaRa C: CEa=U+（Ia+If）Ra D: DEa=U-（Ia+If）Ra

直流并励电动机的电势平衡方程式可写成（）。 A: AEa=U+IaRa B: BEa=U-IaRa C: CEa=U+（Ia+If）Ra D: DEa=U-（Ia+If）Ra

2022-07-25 问题

对于基态氢原子来说，其原子核外轨道能级顺序是( )。 A: E1s＜E2s＜E2p＜E3s＜E3p＜E4s＜E3d B: E1s＜E2s=E2p＜E3s=E3p=E3d＜E4s C: E1s=E2s＜E2p=E3s＜E3p＜E3d=E4s D: E1s＞E2s=E2p＞E3s=E3p=E3d＞E4s

对于基态氢原子来说，其原子核外轨道能级顺序是( )。 A: E1s＜E2s＜E2p＜E3s＜E3p＜E4s＜E3d B: E1s＜E2s=E2p＜E3s=E3p=E3d＜E4s C: E1s=E2s＜E2p=E3s＜E3p＜E3d=E4s D: E1s＞E2s=E2p＞E3s=E3p=E3d＞E4s

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In a syllable, the nucleus + coda constitute the sub-syllabic unit r__________.

There are three kinds of acronyms: ________acronyms, hybrid acronyms and syllabic acronyms.

Which of the following consonants is not a syllabic consonant? A: /m/ B: /n/ C: /l/ D: /r/

These features of speech that involves more than single sound segments are called ____features, which mainly include syllabic structure, stress, tone and intonation.

Generally speaking, which two types can abbreviations be classified into?( ) A: Initials and acronyms B: Contractions and short forms C: Syllabic abbreviations and alphabetic abbreviations

直流并励电动机的电势平衡方程式可写成（）。 A: AE<sub>a</sub>=U+I<sub>a</sub>R<sub>a</sub> B: BE<sub>a</sub>=U-I<sub>a</sub>R<sub>a</sub> C: CE<sub>a</sub>=U+（I<sub>a</sub>+I<sub>f</sub>）R<sub>a</sub> D: DE<sub>a</sub>=U-（I<sub>a</sub>+I<sub>f</sub>）R<sub>a</sub>